Recently I was building a new Windows 7 Home Edition system, when I encountered a hurdle I hadn’t faced before.

I booted from the Windows 7 installation disc, and started ‘nexting’ through the install wizard. I only got a few screens in, when I hit a snag. A dialogue asked, Where do you want to install Windows? – but – no devices were listed in the table.

Strange, I thought.  This screen should list my brand-new SATA disc. I should have 1 terrabyte of disk space ready to partition, format and install Windows.

I rebooted, checked that the BIOS could see the disc (it could), and rebooted.

Needless to say, I hit the same snag. Repeatedly.

After hours of rebooting, refreshing, trying to install updated drivers, fiddling with BIOS settings and re-seating all the SATA connections inside the machine, I found this little pearler in the Microsoft Knowledge Base:

Symptoms: When you try to install Windows Vista, the hard disk on which you want to install Windows Vista does not appear in the Where do you want to install Windows? disk configuration window.

Yes! Yes! That’s me! Just substitute the number ‘7′ for the word ‘Vista’.

Cause: This issue occurs if the hard disk partition contains an invalid byte offset value. For example, this issue occurs if the partition has a byte offset of zero (0).

Okay. Suddenly I’m thinking that my brand-new SATA disk might not be so brand-new after all. Anyway…

Resolution:

1. Use the Windows Vista DVD to start the computer.
2. At the Windows Vista installation screen, click Next, and then click Install Now.
3. Press SHIFT+F10 to start a command prompt.
4. At the command prompt, type diskpart, and then press ENTER.
5. Type select disk number, and then press ENTER. In this command, replace numberwith the number of the hard disk that you want to modify. For example, if you want to install Windows Vista on the first available hard disk, type select disk 0, and then press ENTER.
6. Type clean, and then press ENTER. You receive the following message: “DiskPart succeeded in cleaning the disk.”
7. Type exit, and then press ENTER to exit the DiskPart tool.
8. Type exit, and then press ENTER to exit the command prompt.
9. Restart the computer, and then start the Windows Vista installation.

Problem solved! I got to the same screen, which this time listed the previously-missing storage device:

Of course, it’s easy when you know how.

diskpart · install windows · installation problem · windows 7